katsuragi ace (umamusume), umamusume, highres, 1boy, animal ears, bare arms, bare shoulders, bestboybo, black hair, blue eyes, border, clenched hands, collarbone, cropped legs, cropped torso, ear covers, eyelashes, genderswap, genderswap (ftm), grey border, hair between eyes, hair ornament, horse boy, horse ears, light blush, looking at viewer, lower teeth only, male focus, midriff peek, multicolored hair, open mouth, outside border, pants, pointy nose, ponytail, red pants, short hair, short ponytail, solo, streaked hair, sweat, sweatpants, tank top, teeth, toned, toned male, white background, white tank top